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FexOy-SiO2 nanocomposites studied by Mössbauer spectroscopy

D. PREDOI1,* , V. KUNCSER1, M. ZAHARESCU2, A. JITIANU2, M. CRISAN2, W. KEUNE3, B. SAHOO3, G. FILOTI1, M. RAILEANU2

Affiliation

  1. National Institute R&D for Physics of Materials, P.O. Box. MG 07, 77125, Bucharest - Magurele, Romania
  2. Institute of Physical Chemistry, "I. G. Murgulescu" of the Romanian Academy, 202 Splaiul Independentei, 060021, Bucharest, Romania
  3. Laboratorium fur Angewandte Physik, Universitat Duisburg-Essen, D-47048, Duisburg, Germany

Abstract

FexOy-SiO2 nanocomposites were obtained via the sol-gel method, by using three different precursors for the silica matrix. The morphology and the iron phase composition is strongly influenced by the precursors. The presence of magnetica ly ordered goethite and fayalite is evidenced by low temperature Mössbauer spectroscopy. Subsequent annealing treatments performed on the initial samples have induced the formation of hematite nanoparticles in the silica matrix, mainly on the account of the goethite decomposition. The total amount and the size distribution of the hematite nanoparticles can be contro led via the initial precursors and the subsequent annealing conditions. The simultaneous analysis of the iron phase composition and of the local magnetic interactions in the analysed samples is performed..

Keywords

Nanocomposites, Iron oxide in silica matrix, Sol-gel, Mössbauer spectroscopy, Phase composition.

Submitted at: Jan. 18, 2006
Accepted at: March 23, 2006

Citation

D. PREDOI, V. KUNCSER, M. ZAHARESCU, A. JITIANU, M. CRISAN, W. KEUNE, B. SAHOO, G. FILOTI, M. RAILEANU, FexOy-SiO2 nanocomposites studied by Mössbauer spectroscopy, Journal of Optoelectronics and Advanced Materials Vol. 8, Iss. 2, pp. 518-522 (2006)